He graduated from USMA in 1949. In April 1950, he married Ann née Brown. As a lieutenant, Steffy served in the Korean War, where he suffered frostbite and was wounded in the foot by a grenade. Due to his injuries, he was evacuated from Hungnam to Japan, and later awarded the Bronze Star Medal.[1]

After the war, Steffy served on the Army football staff as the freshman team coach. He later owned a car dealership in Newburgh, New York. With his wife, who died in 2004, he had one son. Steffy died of a heart ailment on May 22, 2011 in Newburgh, New York at age of 85.[1]